Answer: 24.01615J
Explanation:
In order to answer this question, we need to use the formula PEs=(1/2)(k)(x)^2, in this case potential energy equals to work that is why we are available to use this formula. We can not use formula Fs=kx because the gravity is not involved. Now we can substitute the numbers into the formula which will give us, PEs=(1/2)(107N/m)(0.67m)^2,
(x is 0.67 because x is the change is springs length, since spring went from 0.33m to 1m, we can just do 1m-0.33m which will give us the change in length which is 0.67m)
now we can just put the whole equation in the calculator, or you can do it by hand if you want to make your life harder, either way the final answer would be PEs=24.01615J
Hope it helped